If you mean a constant frame rate, use -r:v 25. If you actually mean bitrate, 
use -b:v and -b:a. I think you might want to look at the x264 switches to make 
sure that it is encoded and a constant bit rate, though I am fairly sure 
specifying a bit rate will do it.-------- Original message --------From: akash 
kulkarni <kul.akash...@gmail.com> Date: 8/10/2017  7:18 AM  (GMT-05:00) To: 
FFmpeg user questions <ffmpeg-user@ffmpeg.org> Subject: [FFmpeg-user] CBR and 
bitrate 
hello everyone

i have file with CBR and when i am converting it to other format by using
following command i am getting VBR both video and audio

ffmpeg -i input.mp4 -y -r 25 -c:v libx264 -look_ahead 0 -preset veryfast
-b:v 25M -c:a aac ouput.MTS

so How i can get the output file in CBR mode and frame rate 25.
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